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Abstract

Data records on computer tape typically have bits arranged in parallel bytes across the tape using 7 or 9 tracks, with successive bytes in a block of data spaced 100 microseconds apart when the tape is traveling at the operating speed. In a device having display of 7 element light-emitting diode (LED) units, electrical skew may be adjusted without an oscilloscope.

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United States

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English (United States)

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Electrical Skew Adjustment Technique

Data records on computer tape typically have bits arranged in parallel bytes
across the tape using 7 or 9 tracks, with successive bytes in a block of data
spaced 100 microseconds apart when the tape is traveling at the operating
speed. In a device having display of 7 element light-emitting diode (LED) units,
electrical skew may be adjusted without an oscilloscope.

Adjustment is first made for read skew using a master skew tape having bits
precision recorded in each track in each byte position of a data block, and
thereafter the write skew adjustment is effected.

To adjust for read electrical skew, the master skew tape is read to determine
the duration of the single-shot on the center track. Raw data is sampled to
determine the rise time or the occurrance of a transition, as indicated by point A
of Fig. 1. When this is determined, the program delays to point B whereupon
consecutive reads are taken. The single-shot duration, which may vary from 3 to
33 microseconds, is adjusted to a midrange value of 16 to 20 microseconds.
This adjustment is accomplished by adjusting the potentiometer indicated by the
LED display, shown at Fig. 2, until the indicated data pulse duration is within the
desired midrange value.

Thereafter each of the other tracks are adjusted to correspond to the
reference, center track. As shown in Fig. 3, each track is adjusted to align the fall
of the pulse being adjusted with the fall of the center track pulse, as indicated at
point C. This is accomplished using the LED display as shown in Fig. 4. The
numeral at the left side of the display indicates the potentiometer to adjust. The
bars of the three LED 7 bar...